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Magic gear is part of #cervelolife, even the T3 is pretty restrictive, and you'll want to dial the tyre/seat tube gap in to the aerodynamic optimum if you're serious 🙂
Cervelo p2c as a singlespeed frame:
From looking at internet pictures it seem like the rear dropout is 27mm long which leaves 17mm of adjustment but if you want to run a 25mm tire you have already used 8-10mm to clear the seatstay.
So there is only 7mm of possible adjustment (so not a whole chain link: 12.7mm)
So how do people do it: use magic gearing only, run a 22mm tire?
att: @xavierdisley